Implement fork choice proposer boost uniqueness #4748
Description
Description
The latest spec release includes the change to apply proposer boost only to the first block: ethereum/consensus-specs#3352.
I think we should make this change on the Deneb branch, and roll it out gradually when we merge Deneb to stable. This will allow us to pass the latest spec tests on the Deneb branch.
Steps to resolve
We can also delete the temporary mitigation we added for the RPC unbundling attack, either as part of the same PR, or in a follow-up.